The rupture included swathes of individual data including names and messages and in addition "decoded security inquiries and answers".
It did exclude any Visa information, the site said, including it trusted the assault was state-supported.
In July, Yahoo was sold to US telecoms mammoth Verizon for $4.8bn (£3.7bn).
The FBI has affirmed it is examining the assault.
News of a conceivable significant assault on the innovation firm rose in August when a programmer known as "Peace" was clearly endeavoring to offer data on 200 million Yahoo accounts.
Hurray on Thursday affirmed the break was far greater than first suspected.
The information taken incorporates names, email addresses, phone numbers, dates of birth and scrambled passwords.
Hurray suggested all clients ought to change their passwords in the event that they had not done as such since 2014.
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